12540064243688 has 32 divisors (see below), whose sum is σ = 25474685924160. Its totient is φ = 5763969335040.

The previous prime is 12540064243667. The next prime is 12540064243691. The reversal of 12540064243688 is 88634246004521.

It is a happy number.

It is a super-2 number, since 2×12540064243688² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072161068 + ... + 1072172763.

It is an arithmetic number, because the mean of its divisors is an integer number (796083935130).

Almost surely, 2^{12540064243688} is an apocalyptic number.

It is an amenable number.

12540064243688 is an abundant number, since it is smaller than the sum of its proper divisors (12934621680472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12540064243688 is a wasteful number, since it uses less digits than its factorization.

12540064243688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144333897 (or 2144333893 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 53.

The spelling of 12540064243688 in words is "twelve trillion, five hundred forty billion, sixty-four million, two hundred forty-three thousand, six hundred eighty-eight".